public class lianxi2_5{
   public static void main (String args[]){
     long [] a = {1,2,3,4};
     long [] b = {100,200,300,400,500};
     b =a;
     System.out.println("数组b的长度"+b.length);
     System.out.println("b[0]:"+b[0]);
   }
}
